diff --git a/src/testing/helpers.rs b/src/testing/helpers.rs
index beda9fe..1a4e89b 100644
--- a/src/testing/helpers.rs
+++ b/src/testing/helpers.rs
@@ -32,7 +32,7 @@ pub fn deps_with_creator(
     deps
 }
 
-pub fn assert_err<T, E: std::fmt::Debug>(result: Result<T, E>, error: &E) {
+pub fn assert_err<T, E: std::fmt::Debug, F: std::fmt::Debug>(result: Result<T, E>, error: &F) {
     // Check if result contains specific error
     match result {
         Ok(_) => panic!("Expected Err, got Ok"),